High‐viscoelastic graft modified chitosan hydrophobic association polymer for enhanced oil recovery

Liu, Tao; Gou, Shaohua; Zhou, Lihua; Hao, Jingjing; He, Yang; Liu, Ling; Lan, Tian-Syung; Fang, Shenwen

doi:10.1002/app.50004

Cited by 9 publications

(2 citation statements)

References 36 publications

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“…Furthermore, when the concentration of polymer solution is higher than critical association concentration, hydrophobic groups will have the tendency to form a transient reversible three-dimensional supramolecular network structure, which will make HAP have good thickening characteristics under high-temperature and high-salt conditions [3]. Due to the above characteristics, HAP is widely used in the field of oil development, such as hydraulic fracturing fluid preparation [4][5][6] and polymer flooding [7][8][9][10]. In this paper, HAP was selected to fit the high-temperature and high-salt condition of the Bohai Oilfield reservoir.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Calculating the Relative Permeability Curve of Polymer Flooding Based on the Viscosity Variation Law of Polymer Transporting in Porous Media

Jiang

Hou

et al. 2022

Molecules

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Relative permeability of polymer flooding plays a very important role in oil field development. This paper aimed to measure and calculate the relative permeability curves of polymer flooding more accurately. First, viscosity variation law of polymer in porous media was studied. Rock particles of different diameters and cementing agent were used to make artificial cores and hydrophobically associating polymer solutions were prepared for experiments. Polymer solutions were injected into the cores filled with crude oil and irreducible water. In the process of polymer flooding, produced fluid was collected at different water saturations and locations of the core. Polymer solutions were separated and their viscosities were measured. With the experimental data, the viscosity variation rule of polymer transporting in porous media was explored. The result indicates that the viscosity retention rate of polymer solutions transporting in porous media has power function relationship with the water saturation and the dimensionless distance from the core inlet. Finally, the relative permeability curves of polymer flooding were measured by unsteady state method and the viscosity variation rule was applied to the calculation of the relative permeability curves.

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Section: Introductionmentioning

confidence: 99%

A New Method for Calculating the Relative Permeability Curve of Polymer Flooding Based on the Viscosity Variation Law of Polymer Transporting in Porous Media

Jiang

Hou

et al. 2022

Molecules

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“…Francisco 33 synthesized trimethyl chitosan and trimethyl chitosan hydrophobized with myristoyl chloride and confirmed that they have an excellent ability to enhance the recovery of carbonate reservoirs. Liu 34 synthesized the chitosan grafted imidazoline monomer copolymer, and the core flooding experiments showed that oil recovery could improve up to 8.08%.…”

Section: Introductionmentioning

confidence: 99%

Mobility control capability of a modified chitosan hyperbranched polymer in porous media

Chen

Wang

et al. 2022

J of Applied Polymer Sci

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The residual resistance factor (RRF) is an important parameter expressing the mobility control capability of the polymer, and it is related to the polymer molecular structure. This study investigated the ability of three polymers with different molecular structures to establish RRF in a one‐dimensional sand pack model at different permeabilities. In addition, the static adsorption capacity of the three polymers on the rock surface was investigated, and the mechanism of the polymer retention in porous media was explored by changing the wettability of the rock surface. Furthermore, the microscopic morphological changes of the polymers before and after passing through the porous media were observed by environmental scanning electron microscopy. Finally, nuclear magnetic resonance core flooding experiments were used to investigate the oil displacement characteristics of the three polymers in the core. T Results show that the ability of the three polymers to establish RRF gradually decreases with the increase in permeability. Still, the modified chitosan hyperbranched polymer (HPDACS) has the best ability to establish RRF in porous media with the largest static adsorption equilibrium amount of 1249 μg/g. Mechanical capture is the dominant mechanism for HPDACS to establish retention in porous media. In addition, HPDACS has a better ability to enhance recovery. It can improve oil recovery by 20.43%, which is higher than that by dendritic polymer HPDA at 16.34% and partially hydrolyzed polyacrylamide at 10.07%. HPDACS can establish a larger resistance in the macropores of the core. Thus, the remaining oil is better driven in the medium and small pores. This finding indicates that HPDACS has excellent potential for oil displacement.

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Study on the biodegradability of a chitosan‐modified hyperbranched polymer for enhanced oil recovery

Chen

et al. 2021

J of Applied Polymer Sci

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This study introduced a chitosan‐modified hyperbranched polymer (HPDACS). The biological oxygen demand, chemical oxygen demand, and biodegradability of HPDACS under different water quality were measured under static conditions, as well as the concentration changes before and after degradation. Environmental scanning electron microscopy (ESEM) was used to observe the micromorphology before and after degradation. The biodegradability, viscosity change, and molecular weight change of the polymer before and after passing through the porous medium were measured. The results were compared with the partially hydrolyzed polyacrylamide and the dendritic polymer. The results showed that in bacteria‐containing sewage, the biodegradation rate of HPDACS reached 81%. Moreover, the molecular backbone of HPDACS was completely broken after degradation. Its viscosity loss reached 84.87%, indicating its good biodegradability. HPDACS also can reduce the concentration of polymer in the produced fluid. In core flow experiments, viscosity of HPDACS is loss to 40%. The hyperbranched network structure of HPDACS can reduce the shearing action in the porous medium, thus reducing the extent of biodegradation. The presence of microorganisms resulted in a viscosity loss of HPDACS of ~2%. Therefore, HPDACS can fully exert the fluidity control effect through the porous medium and can meet the requirements of polymer flooding.

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High‐viscoelastic graft modified chitosan hydrophobic association polymer for enhanced oil recovery

Cited by 9 publications

References 36 publications

A New Method for Calculating the Relative Permeability Curve of Polymer Flooding Based on the Viscosity Variation Law of Polymer Transporting in Porous Media

A New Method for Calculating the Relative Permeability Curve of Polymer Flooding Based on the Viscosity Variation Law of Polymer Transporting in Porous Media

Mobility control capability of a modified chitosan hyperbranched polymer in porous media

Study on the biodegradability of a chitosan‐modified hyperbranched polymer for enhanced oil recovery

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